Liquid-phase synthesis of isopropyl tert-butyl ether by addition of 2-propanol to isobutene on the oversulfonated ion-exchange resin Amberlyst-35

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• 作者：Marc Pera-Titus ; Marta Bausach ; Javier Tejero ; Montserrat Iborra ; Carles Fité ; Fidel Cunill ; J. Felipe Izquierdo
• 关键词：Isopropyl tert-butyl ether ; 2-propanol ; Isobutene ; Etherification ; Amberlyst-15 ; Amberlyst-35
• 刊名：Applied Catalysis A: General
• 出版年：2007
• 出版时间：30 April 2007
• 年：2007
• 卷：323
• 期：Complete
• 页码：38-50
• 全文大小：1253 K

文摘

The selectivity and kinetics of the liquid-phase addition of 2-propanol to isobutene to give isopropyl tert-butyl ether (IPTBE) was investigated in a batch reactor over the commercial oversulfonated ion-exchange Amberlyst-35 resin in the temperature range 60–90 °C and 1.6 MPa for 2-propanol/isobutene initial ratios ranging from 0.5 to 3.0. The effect of the initial 2-propanol/isobutene molar ratio and temperature on isobutene conversion (X_IB), IPTBE yield (Y_IPTBE/IB) and selectivity to dimers (S_IPTBE/DIM) and on the initial reaction rate of IPTBE formation (r⁰_IPTBE) was also evaluated. Amberlyst-35 was found to be more active than Amberlyst-15 and medium-pore H-exchanged zeolites for carrying out IPTBE synthesis. Experimental IPTBE formation rates can be successfully represented by two kinetic models derived from the LHHW and ER formalisms, where 2-propanol adsorbed on one active site reacts with isobutene, either adsorbed on one active site in the former model, or in liquid-state in the latter, to give IPTBE also adsorbed on one active site. The apparent activation energy found for both models was estimated to be 71 + 3 kJ mol⁻¹.